Labels not available when creating PR

[daczarne]

I have a workflow that uses actions/labeler to set the PR labels. Workflow yaml looks as follows:

name: Pull request checks

on:
  pull_request:
    types:
      - edited
      - opened
      - reopened
      - synchronize

jobs:
  label-pr:
    name: Add PR labels
    runs-on: ubuntu-latest
    steps:
      - name: PR labeler 🏷
        id: add_labels
        uses: actions/labeler@v3
        with:
          repo-token: "${{ secrets.GITHUB_TOKEN }}"

  get-pr-labels:
    name: Get the PR labels
    runs-on: ubuntu-latest
    needs: label-pr
    outputs:
      labels: ${{ steps.get_pr_labels.outputs.labels }}
    steps:
      - name: Get PR labels 🏷️
        id: get_pr_labels
        uses: joerick/pr-labels-action@v1.0.6

From the label-pr we get the following partial log

##[debug]processing curated-data
##[debug] checking pattern "dags/dmart/curated_data/sql/*.*"
##[debug]  checking "any" patterns
##[debug]    matching patterns against file dags/dmart/curated_data/sql/_dim_product_catalog_updates.sql
##[debug]   - dags/dmart/curated_data/sql/*.*
##[debug]   all patterns matched
##[debug]  "any" patterns matched against dags/dmart/curated_data/sql/_dim_product_catalog_updates.sql

which shows that a label was indeed matched. Such label also appears in the PR

Yet, the log for get-pr-labels shows the following:

No labels were found!

If I re-run all jobs, the same result is observed.

Yet, if any other event occurs, the labels are found. In this case a simple changing of the PR title did the trick (this is because the workflow triggers on PR synchronize).

Not sure how this behaviour could be changed, but it would be nice if the action could detect the labels added during the workflow run in which it is used.

---

This might be quite tricky to achieve since from the github.event.pull_request context I can see that, when the PR is opened we get:

{
  ...
  "event": {
    "action": "opened",
    "pull_request": {
      ...
      "labels": [],
      ...
    }
  ...
}

But after any other event

{
  ...
  "event": {
    "action": "synchronize",
    "pull_request": {
      ...
      "labels": [
        {
          "color": "cfd3d7",
          "default": false,
          "description": "dmart",
          "id": 4351199434,
          "name": "dmart",
          "node_id": "LA_kwDOHsmXus8AAAABA1oIyg",
          "url": "https://api.github.com/repos/daczarne/github_actions_test/labels/dmart"
        },
        {
          "color": "7057ff",
          "default": false,
          "description": "Curated data",
          "id": 4351199439,
          "name": "curated-data",
          "node_id": "LA_kwDOHsmXus8AAAABA1oIzw",
          "url": "https://api.github.com/repos/daczarne/github_actions_test/labels/curated-data"
        }
      ],
      ...
    }
  ...
}

So it looks as if the labels themselves are out the context at create time.